Planograph co



W. G, TROTMAN.

SEAM.

APPLICATION FILED HOV. 9.1911.

1 ,3 1 1 ,927. Patented Aug. 5, 1919.

WITNESS: :3 I I 1: INVENTOR. 7m F 2 5. 7mm,

7M Q H/IZZL,

A TTORNE Y.

'rua comma PLANpnnAPH cO-, WASHINGTON, a. c.

UNITED STATES PATENT OFFICE.

WALTER G. TROTMAN, OF WEST SPRINGFIELD, MASSACHUSETTS, ASSIGNOR T0 G. H. SMITH COMPANY, OF SPRINGFIELD, MASSACHUSETTS, A CORPORATION OF MASSA- CHUSE'I'TS.

SEAN.

Specification of Letters I'atent.

Patented Aug. 5, 1919.

To all whom it may concern:

Be it known that I, WALTER G. Tno'rm m, a subject of the King of England, residing at West Springfield, in the county of Hampden and State of Massachusetts, have in vented a new and useful Seam, of which the following is a specification.

My invention relates to improvements in joining or connecting means for the edges of woven-wire objects, and especially to seams in cylindrical objects, such as covers for dandy-rolls, and resides in a certain peculiar arrangement of stitches with wh1ch the opposed edges of the woven-wire are united or connected, all as hereinafter set forth.

The principal object of my invention 1s to provide a seam, for woven-wire objects, which can be quickly made, is strong and secure, and does not mark the paper when applied to dandy-roll covers, for which use said seam is more particularly designed.

The seams commonly used to fasten together the adjacent or contiguous edges of dandy-roll covers are quite complicated and difficult to make, considerable skill as well as time being required to produce them; such seams are frequently not strong enough to withstand the strain put upon them when the covers are forcibly drawn on to their supporting bodies; and, owing to the thickness of such seams, they mark the paper, which is a great disadvantage and very obj actionable. My seam is simple in character, and sufliciently stron to withstand any strain to which it is liable to be subjecte while at the same time enabling a connection to be formed or made which is even and regular, and of a nature and thickness that avoids or obviates marking the paper.

A single, very fine gage wire is used in my seam, and this wire, when woven in to the woven-wire of the cover, makes a flat or thin connection which is negligible so far as visual marking of the paper is concerned, and it is this feature that is of such importance in dandy-roll cover seams.

Other objects and advantages will appear in the course of the following "dmllpt'mni I attain the objects and secure the advantages of my invention by the means illustrated in the accompanying drawings, in which- Figure 1 is a plan of fragmentary portlons of a dandy-roll cover and a seam which embodies a practical form of my invention, the parts being greatly enlarged and even exaggerated; and Fig. 2 is an end elevation of said cover, the seam portions being in full lines and the remaining portion in broken lines.

Similar reference characters designate similar partsin the two views.

As is well known, the wire mesh ofa dandy-roll cover is very fine, consequently it IS necessary greatly to enlarge the same and the connecting wire in order properly and adequately to illustrate my invention, as I have done in the drawings.

A dandy-roll cover consists of apiece of woven-wire fabric, bearing the design or deslgns of some particular water-mark, which is formed into a hollow c linder, the adjacent edges of such piece 0 fabric belng secured together. In the drawings is represented a dandy-roll cover made of a piece of fabric, consisting of longitudinal wires 1 and annular transverse wires 2, with the adjacent edges of said fabric united by a wire 3 woven into the fabric in a certain peculiar manner which will presently be explained; The cut ends of the wires 2 may or may'not touch each other at the median line of the joint or seam indicated at 4-4. The interstices or openin s between the wires 1 and 2 are designate by the numeral ,5.

The wire 3 must be Interwoven with the fabric, crossing the median line 4, in such a way that the requisite degree of strength is obtained without any liability onthe part of the adjacent edges of said fabric to lap by each other. Should said edges lap, the one over the other,t he resulting extra thickness woi'tld cause the paper to be marked by the seam,and siich a contingency must be avoided. It is necessary, therefore, so'to interweave the wire 3 as to form long stitches for strength and short stitches to prevent lapping. Consequently my seam may be said to consist of a wire (3) interwoven with adjacent edge portions of the fabric of an object, such as a dandy-roll cover, in a zigzag course, and in a manner to form long and short stitches. I

By the term stitch, as herein used, is meant a reach of the wire 3, on one side or the other of the woven-wire fabric, together with enough additional portions of said wire to enter two of the perforations 5 and enga e certain of the sides of said perforations.

n the drawings, the 102E, stitches are re resented atfi' in 738116 f mer neinlg'en the front or outside and the latter on the back or inside of the fabric; and the short stitches are epresented t 8 and are on the back or inside of said ahric with said stitches 7. The shortstitclies 8 must pass through the longitudinal rows of interstices 5 which are most nearly adjacent to the median line 4, and the long stitches 7 through the longitudinal rows of interstices which are most nearly adjacent to said first-named rows. with the ion stitches 6 connecting said stitches 8 an 7, in order to prevent the edges of the fabric from lapping, either at the time the seam is made or subsequently. The reason for this is obvious, it being plainly seen thatthe short stitches hold the adjacent edges of the fabric in place so that one edge cannot slip under or over the other edge as case may be, and that the shorter the ong stitches are the more they assist said short stitches in keepifig said edges in place and the area of said abric or of the cover even anduniforni. Each of the long stitches 6, which is directly connected at one end with one end or the other of one of the short Stit hes 8, en ages at the other end the second iongitu a wire 1 on one side or the other of the median line 4. The stitches 7 alternatewith the stitches 8, which latter are on the same side of the fabric with said stitches, 'l, and said stitches 7, are directly connected with the ends of the stitches 6 which ends arenot directly connected with said stitfihes 8; Thestitehes 6 and '1 embr c s 1 c s po tion of t fa i t air fond the masses ry-strength and. overcome any tendency of said fabric to pull apart. If all short stitehgesweref used, the firstlongitudinalwires 1 on opposite sides of the median line 4, which wires arethose' engaged by said shont stitches, wouldrbe drawn (Intel P1 And-the cover ru1ned.

. ad itional went nfstcengthto th seam is v ovided y iving anohlique direction to a l of stlte es; so that each crosses 0 1 ene n h t a r rs =01 annul wires 2.- in this case each of the long stitches 6 crosses: t ree of the wires 2 and each of the short stitches Stresses .ene of such-wires. By this means p rt of the strain is taken from the longi dinal wires involved and transferred to the lateral or annular wires and so quite generally dislribntcd.

Each end of the wire 3 is turned over, as represented at ll, to prevent the same from hein pnllrd out ol the interstice 5 through whic li t ektcrlds, such interstice being one of those in the outermost lateral or annular row atone end or the other of the cover. Usually no other fastening means for the ends of the wire 3 is needed.

It will now be clearly understood that this scam is strong and durable, and capable of withstanding the strain to which it is subjec'te'd when the cover is drawn forcibly on to the body of the dandy-roll, as well as the wear and tear incident to use in a papermaking machine; that said seam can be easily and expeditiously Jnade; and that, in practice, the wire 3 is fine enough and the seam as a whole thin enough to avoid marking the paper.

in making this scam the edge portions of the fabric which are to be united are first placed together evenly, with inside face against inside face; the wire 3 is then passed through the proper openings 5, going through alining openings in both edge portions each time, and over the adjacent edges of the fabric, eomn'iencing at one end and forming the stitches in succession until the opposite end is reached; and next the now connected portions of the fabric are opened outwardly or separated beyond the seam,

when their contiguous edges are caused by said stitches to assume the proper and desired relationship with corresponding Wires 1 and 2, on opposite sides of the median line 4 in alinelnent. As a final act the seam is ironed or smoothed to remove all bends from the reaches of thelong and short stitches and make the seam Hat. The pronounced obliquity of the stitches 6 is a useful factor in the final ironing or finishing of the seam, as will be clearly apparent.

Although I have shown and described in detail a orna of my invention which has been found to give entire satisfaction, it is to he understood that some departure, in inattens of-slrape, sine, and-construction, may be made withoixtdep'arting from the nature of said invention or exceeding the scope of the appended claim.

What Ielaim as my invention, and desire to secureby Letters Patent, is y I The flbmbination, in a seam of the class described, with .o xljacent edge portions of wovenwine fabric, of a plurality of short stitches on one side of said fabric, each of said stitches crossing the joint in said fabric and a single transverse wire and engaging longitudinal wires which are immediately ad]acent to said joint, a lon stitch on the opposite side of said fabric rom said short stitches; extending from each end of each of short stitches, =eressingtthr-ee transverse wires and said joint and engaging the second connecting adjacent ends of said first-named IOlgitEldiIllll Wire fwhichhis ond the apposite long stitches.

si e0 said joint romt scan of t e s ort 1 stitch with which said long stitch 'is con- WAUI ER TROTMAN' nected, and a long stitch on the same side of Witnesses:

said fabric with said short stitches, crossin A. C. FAIRBANKS,

a. single transverse wire and said joint an F. A. CU'I'IER.

copies of this pstent my be obtained tor the cents each, by addressing the "Commissioner of Patents, Washington, D. 0. 

